## MonitorGamma

##### >Psychtoolbox>PsychGamma

y=MonitorGamma(x,x0,gamma)

This function is commonly used to describe the “gamma” function of a video

monitor. x represents input voltage and y represents luminance. There are two

parameters: threshold x0, and the exponent gamma. In my applications, x and y

have been normalized so that the gamma curve always goes through (0,0) and (1,1),

so I’ve built that constraint into the function:

if x<=x0 then y=0

if x>x0 then y=((x-x0)/(1-x0))^gamma

The arguments can be scalars or matrices; MonitorGamma will do the right thing.

Note that it is unreasonable for x0 to be outside the unit interval, or for g to

be negative, but these constraints are not enforced here.

See MonitorGammaError.

Denis Pelli 5/28/96

Path Retrieve current version from GitHub | View changelog

`Psychtoolbox/PsychGamma/MonitorGamma.m`